Question on wood Roof Trusses[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
- Subject: Question on wood Roof Trusses
- From: "Hyndman, Keith" <KHyndman(--nospam--at)engineeringsi.com>
- Date: Fri, 12 Jan 2001 07:33:53 -0500
I'm having a problem with a 40' span Howe wood roof truss. The web members and bottom chords are 2x4's and the top chord is 2x6. I modeled it in RISA-3D. The interior diagonals are showing compressive forces, yet there le/d > 50 using the 1 1/2" depth. It's member length is about 130". So I guess my guest ion is how do I analyze this truss? The slender member can't takes compressive loads, yet my model shows it in compression. Was the truss built incorrectly or am I not understanding how it works?
Ultimately I have to "piggy-back" this truss with another truss to extend the roof line. Essentially turning a gable into a triangle.
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